Flight B/C

Locked
User avatar
randomdogonapc
Member
Member
Posts: 70
Joined: December 6th, 2022, 7:04 pm
Division: C
State: OH
Pronouns: He/Him/His
Has thanked: 27 times
Been thanked: 11 times
Contact:

Re: Flight B/C

Post by randomdogonapc »

Ok, thanks for all the advice. I’ll test the new rubber and see if it’s worth using compared to my current setup(and check my math again).
just a random dog on a pc
User avatar
pumptato-cat
Exalted Member
Exalted Member
Posts: 348
Joined: June 15th, 2022, 11:04 am
Division: C
Pronouns: She/Her/Hers
Has thanked: 105 times
Been thanked: 80 times
Contact:

Re: Flight B/C

Post by pumptato-cat »

jander14indoor wrote: April 10th, 2023, 10:22 pm A nice side benefit for SO, since you typically fly with defined rubber motor mass, knowing the linear density of your pre-cut motors makes it easy to make up a new motor close to the correct mass. Just back calculate from linear density to length for say 2.0 g and cut your motor accordingly. Maybe slightly long, but not much, and then trim to exact weight. Saves a lot of wasted rubber, and a lot of time.

Jeff Anderson
Livonia, MI
Hey, can you elaborate on how you "back calculate form linear density"? Currently, I'm cutting blanks of 1.9g and calculating density before tying knots to estimate(I don't have enough o-rings otherwise), and I probably have a 1/5 chance of getting the density I need... Wondering if you do a different method(I don't own a rubber stripper though).
anything'll fly if you throw it hard enough
coachchuckaahs
Coach
Coach
Posts: 680
Joined: April 24th, 2017, 9:19 am
Division: B
State: NM
Has thanked: 1 time
Been thanked: 95 times

Re: Flight B/C

Post by coachchuckaahs »

Cat:

Jeff is simply saying you can calculate a length to cut to get your target mass. For example, lets say you have a piece of rubber that is 35" long, and the mass is 2.6g. The density is 0.0674g/in. Lets say your o-rings are 0.015g each, for 0.030g, and your target mass is 1.995g. Then your target rubber mass is 1.965g, and at 0.0674g/in this is 29.14". So, carefully cut your rubber to this length, slip on the two o-rings, use one of the "zero loss" tying methods, and you should have a loop with o-rings at 1.995g. Note: After breaking in, and wiping down, your rubber will probably be 10-20mg lighter. (Note: your o-rings may differ in weight, this is a hypothetical number)

Rubber motor tying without trimming can be seen here: https://youtu.be/5u4ghL21ij8

Note also that rubber will vary in linear density along its length. So I would cut maybe half an inch long, and then trim down while hanging from a mg scale until you hit your rubber target weight. I always make a wire hanger to hang the rubber under the scale. I have found putting it in a cup or pan on top of the scale can impact scale readings substantially (even over 1/2g) if the rubber was just cut or just wiped (static electricity).

Coach Chuck
Last edited by coachchuckaahs on April 11th, 2023, 4:24 pm, edited 1 time in total.
Coach, Albuquerque Area Home Schoolers Flying Events
Nationals Results:
2016 C WS 8th place
2018 B WS 2nd place
2018 C Heli Champion
2019 B ELG 3rd place
2019 C WS Champion
AMA Results: 3 AAHS members qualify for US Jr Team in F1D, 4 new youth senior records
User avatar
randomdogonapc
Member
Member
Posts: 70
Joined: December 6th, 2022, 7:04 pm
Division: C
State: OH
Pronouns: He/Him/His
Has thanked: 27 times
Been thanked: 11 times
Contact:

Re: Flight B/C

Post by randomdogonapc »

Hi!
Now that a lot of regionals and all invites are over, I was wondering if anyone is willing to share flight times from your competitions. I’ll start.
Central Ohio Regional the top flight time was a 2:43 Div C and a 2:06 Div B (Ceiling 53 feet but only flyable 45-42 ish feet)
West Liberty Invite the top div B flight time was a 2:46 Div B(Ceiling 28ft)
These users thanked the author randomdogonapc for the post:
pumptato-cat (April 17th, 2023, 10:43 am)
just a random dog on a pc
Banana2020
Exalted Member
Exalted Member
Posts: 41
Joined: January 2nd, 2020, 5:42 pm
Division: C
State: PA
Pronouns: He/Him/His
Has thanked: 2 times
Been thanked: 11 times

Re: Flight B/C

Post by Banana2020 »

Southwest Pennsylvania Regional(16ft ceiling, AC on, conference room) won by a 1:55 flight in Div B and I think 1:30 in Div C.
“There are more things to alarm us than to harm us, and we suffer more often in apprehension than reality.” – Seneca
Nats 2022:
3rd EXPD!!
5th Electric Wright Stuff
5th Sounds of Music
User avatar
pumptato-cat
Exalted Member
Exalted Member
Posts: 348
Joined: June 15th, 2022, 11:04 am
Division: C
Pronouns: She/Her/Hers
Has thanked: 105 times
Been thanked: 80 times
Contact:

Re: Flight B/C

Post by pumptato-cat »

randomdogonapc wrote: April 17th, 2023, 9:58 am Hi!
Now that a lot of regionals and all invites are over, I was wondering if anyone is willing to share flight times from your competitions. I’ll start.
Central Ohio Regional the top flight time was a 2:43 Div C and a 2:06 Div B (Ceiling 53 feet but only flyable 45-42 ish feet)
West Liberty Invite the top div B flight time was a 2:46 Div B(Ceiling 28ft)
Was AC on for any of these competitions?
Also, thank you so much for this information! It's very helpful, as I haven't gone to my State competition and am very stressed.
anything'll fly if you throw it hard enough
User avatar
randomdogonapc
Member
Member
Posts: 70
Joined: December 6th, 2022, 7:04 pm
Division: C
State: OH
Pronouns: He/Him/His
Has thanked: 27 times
Been thanked: 11 times
Contact:

Re: Flight B/C

Post by randomdogonapc »

pumptato-cat wrote: April 17th, 2023, 10:44 am
Was AC on for any of these competitions?
Also, thank you so much for this information! It's very helpful, as I haven't gone to my State competition and am very stressed.
Nope!
Last edited by randomdogonapc on April 17th, 2023, 11:42 am, edited 2 times in total.
just a random dog on a pc
User avatar
randomdogonapc
Member
Member
Posts: 70
Joined: December 6th, 2022, 7:04 pm
Division: C
State: OH
Pronouns: He/Him/His
Has thanked: 27 times
Been thanked: 11 times
Contact:

Re: Flight B/C

Post by randomdogonapc »

Hi,
So I went flying again today and the wire on my torque meter slipped out of where it was held. I’m using the J&H torque meter, which secures the torque by threading it through two holes in the back. The wire is all bent now. I’m pretty sure it should still work, but not entirely. I can fix the issue with the torque wire slipping, but will a bent torque wire still show the same results?
just a random dog on a pc
User avatar
pumptato-cat
Exalted Member
Exalted Member
Posts: 348
Joined: June 15th, 2022, 11:04 am
Division: C
Pronouns: She/Her/Hers
Has thanked: 105 times
Been thanked: 80 times
Contact:

Re: Flight B/C

Post by pumptato-cat »

If it helps at all, my FF wire is curved and I haven't noticed a difference in flight.
These users thanked the author pumptato-cat for the post:
randomdogonapc (April 18th, 2023, 11:40 am)
anything'll fly if you throw it hard enough
jander14indoor
Member
Member
Posts: 1653
Joined: April 30th, 2007, 7:54 am
Has thanked: 0
Been thanked: 29 times

Re: Flight B/C

Post by jander14indoor »

Well, with SciOly being down for a while, I wasn't able to share the MI state tournament results. So, here we go:
Div B (where I was ES):
Winning time 3:13.5 by MacDonald MS
Second Place 2:39.5 by Meads Mill MS (heading to national tournament)
Third Place 2:38.3 by Clague MS (heading to national tournament)
Two other teams over two minutes
Nine teams between one and two minutes
41 total teams
Only a few teams tiered, again, oversize boxes.
Many partial logs, biggest reason was units!!
AC was on, but you could fly between the events if you set up you plane for a small enough circle and launched in correct spots. Noticeable, but not the worst flying conditions I've seen.


Div C:
Winning time 2:45.3 by East Lansing HS
Second Place 2:29.2 by Holt HS
Third Place 2:12.1 by Novi HS (heading to national tournament)
Five other teams above two minutes
Seventeen teams between one and two minutes
41 total teams

Jeff Anderson
Livonia, MI
Locked

Return to “Flight B/C”

Who is online

Users browsing this forum: No registered users and 0 guests